Soundboard springs and hysterisis: question for Del F.

[Delwin D Fandrich]

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  ----- Original Message -----=20
  From: St=E9phane Collin=20
  To: pianotech@ptg.org=20
  Sent: February 10, 2002 2:25 PM
  Subject: Re: Soundboard springs and hysterisis: question for Del F.


  Hi, list.

  I don't know if this is relevant, but I would like to share this =
experience with list.  I have a wonderful old Bechstein grand 7 ft 8 in =
from 1877, with a real great acoustic potential, in my opinion.  I am =
now voicing it to the best I can.  I strugled with a kind of =
agressiveness problem, trying to localise where I had to needle in the =
hammers to get it right.  For some reason, I took out of the piano the =
damp chaser system it had, and this appeard to solve my problem.  In =
fact, the system was installed high in between the wooden frame blocks, =
and the plastic cover of the system was slightly pushing against the =
soundboard.  This appeard clearly to dampen the fundamentals of all =
notes, giving the feel of less sustained and more agressive sound.

  Wouldn't you expect a soundboard spring to cause the same kind of =
sound problem ?

  St=E9phane Collin
  Bruxelles, Belgium


Keep in mind there is little actual experience with this idea--some =
limiited experimental work by a very few technicians (and that many =
years ago)--but this did not seem to be a problem.=20

In theory the added spring pressure increases the mechanical impedance =
of the soundboard system to the lower frequencies (predominatly) which =
should improve (or restore) low frequency, or fundamental, sustain.

Del

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